White House Cornerstone

Host Brad Meltzer enlists America's help to find lost and stolen historical artifacts, which are going missing from museums and public collections at an alarming rate. Among the missing: the White House cornerstone, the very first piece of the White House, laid by the secretive Freemasons. Then, letters from an American soldier in Vietnam-pilfered for enemy propaganda. Plus: a lost gun might be the key to solving the infamous Amityville murders.